Gate-Shaped FRP Backrest Frame with Oblique Transverse Reinforcement

The patent applies composite materials by combining resin with reinforcing fibers (such as glass fibers or carbon fibers) to create an FRP (fiber-reinforced plastic) frame structure. This composite material provides high stiffness comparable to metal while maintaining lightweight characteristics, directly resolving the contradiction between stiffness and weight.

The patent implements local quality by strategically positioning reinforcing fibers within the transverse frame, particularly concentrating them in areas requiring enhanced stiffness such as the center portion and regions connecting to side frames. This localized reinforcement achieves high stiffness where needed while minimizing overall material usage and weight.

Instead of increasing plate thickness, the patent uses composite materials with reinforcing fibers embedded in the resin framework. This approach achieves enhanced stiffness through material composition rather than geometric thickening, preserving weight savings while meeting stiffness requirements.

The patent applies reinforcing fibers locally in the transverse frame rather than uniformly throughout the entire structure. This selective reinforcement provides necessary stiffness in critical areas without adding unnecessary weight, effectively resolving the contradiction between stiffness improvement and weight savings.

The patent uses composite materials with reinforcing fibers to achieve stiffness improvement without adding complex rib structures. The fibers provide structural reinforcement that enhances stiffness while maintaining the simplicity of the frame geometry, thereby preserving formability and reducing manufacturing complexity.

The patent extracts the stiffness-enhancing function from complex geometric features (ribs) and transfers it to the material composition (reinforcing fibers). This allows the frame to maintain its simple, easily formable geometry while achieving the required stiffness through material properties rather than structural complexity.

The patent employs composite materials with reinforcing fibers that can be directly embedded in the resin during standard molding processes. This approach achieves high stiffness without requiring complex pre-formed mandrels or three-dimensional braiding, simplifying the manufacturing process while maintaining structural performance.

The patent changes the manufacturing approach by using reinforcing fibers that can be processed through conventional molding techniques rather than requiring specialized RTM processes with complex mandrels. This parameter change in manufacturing methodology reduces process complexity and cost while achieving the desired stiffness through optimized fiber placement and resin composition.